As far as memory management goes the iPadOS memory management would be irrelevant if it booted MacOS. Doesn't kill the battery on a MacBook Air.macOS apps aren’t designed for the 11” screen of the standard iPad, or for iPadOS’s more limited memory management. macOS would burn through the battery pretty quickly.
I won’t say that Apple will never put macOS on an iPad, but it’s been 15 years since iPad was first released, and 4+ since they gave it an M-series chip, so I’m not holding my breath.